Improvement in hollow-ware grinders



E. W. GUNN.

HOLLOW WARE GRINDER.

N 0 174.- 8 O 8 Patented March 14, 18 76.

INVENTOR,

' ATTORNEY? NJETERS, PNOTO-LITROGRAPHER. WASHINGTON D C NITED STATES;

E. WILLIAM GUNN, OF NEW WOODSTOCK, NEW YORK.

IMPROVEMENT IN HOLLOW-WARE GRINDERS.

Specification forming part of Letters Patent No. 174,808. dated March 14,1876; application filed February 5, 1876.

To all whom it may concern:

Be it known that I, E. WILLIAM GUNN, of New Woodstock, county of Madison and State of New York, have invented a new and valuable Improvement in Hollow-Ware Grinders; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon,

Figure 1 of the drawings is a representation of a perspective view of my machine, and Fig. 2 is a longitudinal sectional view thereof. Figs. 3, 4, 5, and 6 are detail views.

This invention has relation to machines which are designed for various kinds of hollow ware; and the nature of my invention consists, mainly, in revolving expansible arms having grinding-blocks on their free ends, and applied to a revolving mandrel, in combination with a horizontal table which can be turned about its axis and raised or depressed, and which is mounted upon a carriage, as will be hereinafter explained.

The invention also consists in a loaded looking device and a long handle for working it, in combination with a table which is perforated and shouldered, as will be hereinafter explained.

In the annexed drawings, A designates the frame of the machine, which is constructed with horizontal ways a, on which roll the grooved wheels of a carriage, B, that is held upon the said ways by means of clasps b. O U designate two standards, having journalboxes secured to their upper ends, in which turns the hollow mandrel of belt-pulleys c 0, through which mandrel a rod. D, passes freely, and is allowed to receive endwise movement. On one end of the mandrel a disk, (I, is secured, to which two bowed arms are pivoted, lettered E E, and bearing on their free ends grinding and polishing blocks 0 e, of any suitable size and shape, which blocks are embraced by tapered holders 9 g, thus preventing their displacement. The arms E E are connected by toggle-levers F F to a collar, j, which embraces freely a groove made in the end of the rod D. By these means the arms E E, with their grinding-blocks e 6, can be rotated. At the same time the attendant, by grasping the handle of rod D and moving this rod endwise, can expand or bring together the blocks 0, and thus adapt them to different diameters of hollow ware. A lug, h, on rod D, and a stop, It, on standard 0, will prevent the separation of the arms E E when the blocks 0 e are not grinding. Instead of using the endwise-sliding rod D, a screw-threaded rod (shown in Fig. 5) may be used, in which case this rod will betapped through the mandrel of pulleys c c, and applied to the collar j in the same manner as rod D. Rising from the center of the carriage B is a post, G, which is vertically adjustable by means of nuts t 1;, and which is free to turn. To this post a circular table. J, is secured. which, in practice, will be provided with four holders for the hollow ware, arranged at regular intervals apart. Each holder consists of a semicircular flanged portion, K, of proper size, a clamping-strap, K and a catching-standard, K The holders will vary in shape and size, according to the different shapes and sizes of the articles to be ground and polished. On one side of the carriage B is a loaded locking-catch, k, which is pivoted to a vertically-adjustable post, I, and has a long rod, m, connected to it, which can be rested upon the standard 0 when it is not in immediate use. The inner hooked end of the catch it engages in one of severalholes made through the table J, and holds the table firmly when a vessel is in position for being polished. By giving the rod m a slight turn the catch can be disengaged from the table, and the latter turned one'quarter around by means of a hooked rod, L. Rod m is used for moving the carriage B back and forth on its ways. The arms' E E may be crossed, and, instead of the grinding-blocks e 6, (shown in 'Figs. 1 and 2,)semi-cylindrical grinding-blocks (shown in Fig.6) may be used for grinding cylindrical pipes or vessels. -A spiral spring may be adjusted to the sliding rod to help resist the centrifugal force of the grindingblocks.

What I claim as new, and desire to secure by Letters Patent, is-- 1. In a hollow-ware grinder, revolving expansible grinders e 0, applied to arms E E, and controlled by means of a rod, D, in combination with a turn-table, J on a carriage, B, sub- 5. The endwise-movable rod D, levers F, and arms E, in a machine constructed as and for the purpose set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

E. WILLIAM GUNN.

Witnesses:

JAS. ALLEN, G. H. MOFFETT. 

